Electric transmitter for driving sewing machines and the like



Feb. 8, 1949. E. P. TURNER 2,451,504

ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Filed Nov.3, 1947 3 Sheets-Sheet l INVENTUB. 5a gaz (P 74mm: WITNESS. BK IAYY'OPNEY Feb. 8, 1949. E. P. TURNER 2,461,504

ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Filed Nov.3, 1947 3 Sheets-Sheet 2 Q x Q g L S,

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E. P. TURNER 2,461,504 ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINESAND THE LIKE Filed Nov. 3, 1947 3 Sheets-Sheet 3 WE. cgyaz Q UuwzazWITNESS, BX

(fl/ %42aa@ ATTORNEY Patented Feb. 8, 1949 ELECTRIC TRANSMITTER FORDRIVING SEWING MACHINES AND THE LIKE Edgar P. Turner, Fanwood, N. Jasslgnor to The Singer Manufacturing Company, Elizabeth, N. J., acorporation of New Jersey Application November 3, 1947, Serial No.783,791 12 Claims. (01. 172-36) This invention relates to electrictransmitters or motor-clutch drives for sewing machines and the like,the motor being an electric motor with a stationary stator surrounded bya rotor which acts as the driving element of the clutch.

One of the objects of this invention is the provision of a motor of theabove type which has a minimum overall length and which is compact andmay be placed beneath a sewing table without undue interference with theknees and legs of the operator. To this end the driven shaft extendsthrough the hollow motor shaft and is manually shiftable endwise for thepurpose of engaging and disengaging the clutch.

Another object of this invention is to provide an improved brake-ringsupport which may be readily adjusted and clamped in set position withinthe motor casing.

Another object of this invention is to provide an improved casing for amotor of the inverted type which is in the shape of a cup and throughthe open end of which the motor may be readily assembled anddisassembled, the casing being partially split so that a brakesupporting ring can be clamped in the open end.

Another object of this invention is the provision of improved means forresiliently pressing the driven disk of the clutch against the brake,together with means for adjusting the pressure of the driven elementagainst the brake when the manual control lever is released.

With the above and other objects in view, as will hereinafter appear,the invention comprises the devices, combinations and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention, from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

In the drawingsa I Fig. 1 is a top plan view of a motor-clutch driveembodying my invention.

Fig. 2 is a longitudinal vertical sectional view taken substantiallythrough the center of the motor-clutch drive shown in Fig. 1.

Fig. 3 is a reduced left end elevation of the motor-clutch drive shownin Fig. 1.

In the embodiment of my invention selected for illustration, my improvedelectric transmitter or motor-clutch drive comprises a hollowcylindrical cup-shaped casing in formed with attaching feet i l on itsouter surface. Diametrically opposite the feet H, the open end of thecasing III is split at l2 and on opposite sides of the split the rimportion is formed with clamping lugs 13 which are apertured to receive aclamping bolt It. The cylindrical casing I0 is also formed with acentrally arranged tubular portion IS on which is tightly fitted astationary electromagnetic element 16 having the windings 11 of anelectric motor.

The rotary electromagnetic element of the motor encircles the stationaryelements [6 and comprises the ordinary ring type squirrel cage rotor 18,die-cast in a-spider 19, which is fixed to a cup-shaped member 20,secured upon the free end of a tubular motor shaft 2| journaled in theball-bearings 22 and 23 carried internally by the tubular portion ii ofthe casing 10. The rotor 18 and spider 19 are in effect a flywheel, andthe spider I9 is provided with a driving friction disk 25 which isremovably held in a depression in one end of the spider by means of asplit ring 24. A driven shaft 26 extends through the tubular motor shaft2| and has one of its ends journaled in a ball bearing 21, locatedwithin the cup-shaped portion of the member 20, and its other endextends through the inner race of a ball bearing 28. The inner race ofthe bearing 28 is held between a shoulder 29 formed on the shaft 26 anda nut 30 threaded on the reduced end of the shaft. The outer race of thebe.- bearing 28 is clamped between the slidable guzde members 3| and 32which are held together by screws 33. The guide members 3| and 32 areslidable in the guideway 34 formed in the tubular portion l5 of theframe and movement is imparted to these members by a bell-crank lever 35having one end 36 apertured for connection to a treadle and its forkedother end pivoted by the pivot pin 44 to a block 31 which is pivotallyconnected by a screw 38 to an angularly adjustable arm 39 seated in agroove 40 formed on the outer periphery of the tubular portion 15 of theframe.

The knee of the bell-crank is operatively connected by a pivot pin 40and slot 4| to a head 42 connected by a reduced neck portion 43 to theslldable member 32.

Adjacent the ball-bearing 21 and upon the end of the shaft 26 there isfixed the hub 45 of the driven element 46 of the clutch. The drivenelement 46 has a flat peripheral portion 41 which is disposed betweenand is adapted to engage either the driving friction disk 25 or a brakering 48 carried by the flange 43 of a brake-support ring 50 which isseated in the open split-rim of the casing l0, and is clamped in setposition therein by the screw H. Secured by headed pins 52 to the drivenelement of the clutch 46 is a pulley 53 which is held in position by acup-shaped as viewed in Fig. 2, and through the ball-bearing 28 theshaft 26 ismoved endwise to bring the driven element 46 into engagementwith the driving friction disk 25 of the driving element. This causesthe driven element 46 to rotate and through the pulley 53 to drive themachine. When it is desired to stop the rotation of the driven element,the end 36 of the bell-crank lever 35 is moved in the oppositedirection, or downwardly as viewed in Fig. 2, and 'this motion throughthe above described connection causes the driven element 43 to engagethe brake ring 48 and to stop the machine.

In order to hold the driven element yieldingly against the brake andthus hold the sewing machine at rest when the manually controlled lever35 is relea"ed, I have provided a fiat bow-spring 56 formed with acentral aperture which embraces the neck 43 and lies against theshoulder 51 of the slide member 32. The free ends of the spring 55 areapertured to adjustably receive the ends of the rods 58 which passthrough suitable openings in the casings Ill. The other end of eachrod'is offset at 59 and is formed with a lip 68 which overhand the brakesupporting ring 50. The ends of the rods 58 which extend through theapertures in the bow-spring 46 are threaded to receive the adjustingnuts Bl. When the brake and clutch friction disks become worn, by simplyloosening the bolt H the ring 50 may be shifted laterally in the casingIn to effect a new adjustment. It will be observed that the drivenelement 41, the shaft 26 and the mechanism for shifting I it, the rods58 and the bow-spring 55 all move as a unit with the brake when it isadjusted, therefore the adjustment of the brake does not disturb therelation of the parts. Also this construction insures that theadjustment of the brake will not disturb the face-to-face relationshipbetween the driven element and the braking surface.

Referring to Fig. 2, it will be noted that the adjustable arm 39 has aU-shaped portion and that the free end 39' of the U overlies the edge ofthe tubular portion l of the frame. When the screw 38 is loosened thisconstruction permits the arm 39 to be swung or rotated about the tubularportion 15 as a center and this movement will cause the entire mechanismfor shifting the driven shaft endwise to swing or move through the sameangle. After the actuating mechanism has been moved to the desiredposition the screw 38 may be tightened and this will cause the free limb33' of the arm 39 to clamp the arm 39 to the tubular portion l5 and thuslock the shifting mechanism in the desired position. This arrangementpermitsthe clutch to be actuated from various angular positions.

Having thus set forth the nature tion, what I claim herein is:

1. An electric power transmitter comprising a hollow cylindrical framewith a tubular portion extending into said frame from one end thereof. astationary motor-element mounted on said tubular portion. a rotarymotor-element disposed externally of said stationary element and mountedof the inven-' on a tubular motor shaft journaled in said tubular frameportion, a driven shaft extendin through the tubular motor shaft, adriven clutchelement fixed to one end of said driven shaft, andmechanism operatively connected to the other end ofls said driven shaftfor shifting said shaft endw e.

2. An electric power transmitter comprising a hollow cylindrical framewith a tubular portion extending into said frame from one end thereof, astationary motor-element mounted on said tubular portion, a rotarymotor-element disposed externally of said stationary element and mountedon a tubular motor shaft journaled in said tubular frame portion, adriven shaft extending through the tubular motor shaft, a drivenclutch-element fixed to one end of said driven shaft, a clutch frictionring carried by the rotary motor-element, a brake carried by said frameand manually controlled mechanism connected to said driven shaft formoving it endwise to cause the driven clutch element to engage eitherthe driving friction ring or the brake.

3. An electric power transmitter comprising a frame with a centrallyarranged tubular post, an electric motor stator fixed to the outerperiphery of said tubular post, a tubular motor shaft journaled inbearings carried by said post, a rotor disposed externally of saidstator and carried by said shaft, said rotor being the driving elementof a clutch, a rotary driven shaft extending through said tubular motorshaft, a brake element carried by said frame and spaced from the rotorof the motor, a driven clutch element disposed between the rotor of themotor and the brake, said clutch element being fixed to said drivenshaft, and means operatively connected to one end of said driven shaftfor moving it endwise to cause the driven clutch element to engageeither the rotor of the motor or the brake.

4. An electric power transmitter comprising a frame with a centrallyarranged tubular post, an electric motor stator fixed to the outerperiphery of said tubular post, a tubular motor shaft journaled inbearings carried by said post, a rotor and operatively connected to saiddriven shaft for moving said shaft endwise to cause the driven elementto engage either the driving element or the brake.

5. An electric power transmitter comprising a frame with a centrallyarranged tubular post, an electric motor stator fixed to the outerperiphery of said tubular post, a tubular motor shaft journaled inbearings carried by said post, a rotor disposed externally of saidstator and carried by said shaft, said rotor being the driving elementof a clutch, a driven shaft extending through said tubular motor shaft,a brake element carried by said frame and spaced from the rotor of themotor, a driven clutch element disposed between the rotor of the motorand the brake, said clutch element being fixed to said driven shaft, aballbearing having its inner race fixed to said shaft, and a leveroperatively connected tothe outer race of said ball-bearing for shiftingsaid driven shaft endwise.

6. An electric transmitter comprising a cupshaped frame having acentrally arranged tubular post, an electric motor-stator on said post,an electric motor rotor arranged externally of said stator, a spidercarrying said rotor, a tubular motor-shaft journaled in said post androtatably supporting said spider and rotor, a driven shaft extendingthrough said tubular motor-shaft and journaled in bearings arrangedcoaxially of said motor-shaft, adriven clutch element carried by saiddriven shaft, and manually actuated means carried by said frame foraxially moving said driven shaft.

'7. An electric transmitter comprising a cupshaped frame having a splitin its rim portion, an electric motor located within said frame andhaving a driving clutch element, a driven clutch element rotatablycarried by said frame, an annular brake-support fitted into thelopen endof the frame, a brakecarried by said support, and means for clampingsaid brake-support in its adjusted position within the open end of thecasing.

8. An electric transmitter having a frame, a stator carried by saidframe, a rotor iournaled in said frame, said rotor being the drivingelement of a clutch, a shaft journaled in said frame and carrying adriven element, abrake adjustably secured for movement endwise in saidframe, manually controlled mechanism for moving said driven shaftendwise to cause the driven element to engage either the brake or thedriving element, and an adjustable bow spring having its central portionpressing against said mechanism for constantly urging the driven elementinto engagement with said brake.

9. An electric transmitter having a frame, a stator carried by saidframe, a rotor journaled in said frame, said rotor being the drivingelement of a clutch, a shaft journaled in said frame and having a drivenelement, a brake adjustably secured for movement endwise in said frame,manually controlled mechanism for moving said.

driven shaft endwise to cause the driven element to engage either thebrake or the driving element, a bow spring having its central portion inengagement with said mechanism for constantly urging the driven elementinto engagement with said brake, and adjustable tie rods connecting theends of said bow spring with said adjustable brake.

10. An electric transmitter comprising a casing having a centrallyarranged tubular post, a sta- 5 tionary motor-element on said post, arotary moelement, a driven shaft extending through said motor shaft andhaving one of its ends journaled in a bearing carried by saidmotor-shaft and its other end fixed to and journaled in a bearingslidably supported in the tubular post of said frame, a driven elementcarried by said driven shaft, and manually operable mechanism forsliding said last mentioned bearing longitudinally I in the tubular postof said frame.

11. An electric transmitter comprising a frame,

an electric motor carried by said frame and having a driving clutchelement, a driven clutch element movable into and out of engagement withsaid driving clutch element, a shaft on which said driven clutch elementis mounted, and means for shifting said shaft endwise including a guidemember operatively connected to saidshaft and slidable in said frame, alever pivotally connected to said guide member, an arm rotatablyadjustable in agroove formed in said frame, said arm being pivotallyconnected to said lever, and means for clamping said arm to said frame.

12. An electric power transmitter comprising a hollow cylindrical framewith a tubular portion extending into said frame from one end thereof,

a stationary motor-element mounted on said tubular portion, a rotarymotor-element disposed externally of said stationary element and mountedon a tubular motor shaft journaled in said tubular frame portion, adriven shaft extending through the tubular motor shaft, a drivenclutchelement fixed to one end of said driven shaft, 9. driving pulleydirectly connected to said driven element, and mechanism operativelyconnected to the other end of said driven shaft for shiftin I said shaftendwise.

EDGAR P. TURNER.

No references cited. r

